Camera preview in Scene window doesn't change on setting Clear Flags to Depth Only or Don't Clear until the camera is re-selected

Steps to Repro:
1. Create a new Project
2. Hierarchy > select Main Camera
3. Change Clear Flags to Depth Only

Actual Result:
Camera preview doesn't change in real-time

Expected Result:
Camera preview changes on changing Clear Flags

Environment:
Windows and Mac

Occurring with:
2019.3.0a4, 2019.2.0b4, 2019.1.4f1, 2018.2.7f1, 2018.2.0a1

Working with:
2018.1.9f1, 2017.4.17f1